The most likely cause of the symptoms of stiffness in the soft tissues of the calves or calf muscles is a local blood circulation disorder. When blood circulation is impaired, it causes a state of hypoxia and ischemia in the local soft tissues, and this state can lead to symptoms of spasm in the myofascia. This spasm symptom can be mild and chronic or sudden and severe, and in either case, it can lead to the manifestation of stiffness in the calf muscles. It can also be caused by chronic inflammation of the calf, chronic inflammation of the soft tissues of the calf, most of which is triggered by exertion and is usually painful. If localized stiffness is accompanied by symptoms of localized pain, it is usually due to inflammation. There are also some calf muscle stiffness symptoms, is due to excessive fatigue triggered, this situation is usually a transient calf muscle stiffness.